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> Date: Thu, 06 Feb 1997 12:47:27 -0800
> From: Carlos Vasconcellos <carlosv@ma*.co*.br*>
> Reply-to: carlosv@ma*.co*.br*
> To: techdiver@aquanaut.com
> Subject: How to Transform Liters to Cubic Feet
> Dear All,
>
> Do any of you know how to calculate how many cubic feet has a cylinder
> of X litters. I tried to find out the exchange constant but i didn't.
>
> for example: How many cubic feet has a cylinder of 18 Liters ?
>
> Is the work pressure important to make this calculation or the only
> information i have to know are the amount of litters or Cubic Feet
> (capacity) of the cylinder to convert and the exchange constant ?
>
>
> Best Regards,
>
>
> Carlos Vasconcellos
> CarlosV@ma*.co*.br*
>
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>
Carlos,
The conversion of liters to cubic feet works as follows:
When a tank size is measured in liters, it refers to the
internal space of the tank when its empty NOT the amount of
compressed gas the tank holds. Think about a container
that holds a liter of liquid. Now take that capacity and multiple it
by 10.5 and you have the internal space of an aluminium 80cuft tank.
An aluminium 80 (77cuft.) is about a 10.5 liter tank.
When a tank is measured in cubic feet, it refers to the amount
of compressed gas the tank holds NOT the internal space of the tank.
An old style 72cuft tank hold 71.2cuft when its full at 2475psi
( 2250psi + 10% = 2475psi ). A genisis 80cuft. tank holds 80cuft.
at 3500psi ( no 10% overfill on these tanks). The gensis 80cuft holds
about the same amount of compressed gas as the old style 72cuft.
but the tank is 20% smaller and is pumped about1000psi higher.
So even though they both hold about the same amount of gas, one is
physically bigger than the other.
To convert cubic feet to liters, use the following formula:
cubic feet
---------------- X 411 = liters
tank pressure
77cuft.
aluminium 80 at 3,000psi = ------------ X 411 = 10.5 liters
3,000psi
108cuft
steel 108 at 2,640psi = ------------ X 411 = 16.8 liters
2,640psi
71.2cuft
steel 71.2 at 2640psi = ----------- X 411 = 11.8 liters
2,475psi
80cuft
gensis 80 at 3,500psi = ---------- X 411 = 9.4 liters
3500psi
There it is, and that is how it works!
Ted
Ted Green owner
Tidewater Aquatics (dive store)
Salisbury Maryland USA
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